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diff --git a/lib/strnlen1.c b/lib/strnlen1.c
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+/* Find the length of STRING + 1, but scan at most MAXLEN bytes.
+ Copyright (C) 2005-2006, 2009-2022 Free Software Foundation, Inc.
+
+ This file is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as
+ published by the Free Software Foundation; either version 2.1 of the
+ License, or (at your option) any later version.
+
+ This file is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>. */
+
+#include <config.h>
+
+/* Specification. */
+#include "strnlen1.h"
+
+#include <string.h>
+
+/* Find the length of STRING + 1, but scan at most MAXLEN bytes.
+ If no '\0' terminator is found in that many characters, return MAXLEN. */
+/* This is the same as strnlen (string, maxlen - 1) + 1. */
+size_t
+strnlen1 (const char *string, size_t maxlen)
+{
+ const char *end = (const char *) memchr (string, '\0', maxlen);
+ if (end != NULL)
+ return end - string + 1;
+ else
+ return maxlen;
+}